projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| e1f414b6 | 1 | /** @file\r |
| 2 | SwitchStack() function for IA-32.\r | |
| 3 | \r | |
| 4 | Copyright (c) 2006 - 2007, Intel Corporation<BR>\r | |
| 5 | All rights reserved. This program and the accompanying materials\r | |
| 6 | are licensed and made available under the terms and conditions of the BSD License\r | |
| 7 | which accompanies this distribution. The full text of the license may be found at\r | |
| 8 | http://opensource.org/licenses/bsd-license.php\r | |
| 9 | \r | |
| 10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 12 | \r | |
| e1f414b6 | 13 | **/\r |
| 14 | \r | |
| 1efcc4ae | 15 | \r |
| f734a10a A |
16 | #include <BaseLibInternals.h>\r |
| 17 | \r | |
| e1f414b6 | 18 | \r |
| 19 | /**\r | |
| 20 | Transfers control to a function starting with a new stack.\r | |
| 21 | \r | |
| 22 | Transfers control to the function specified by EntryPoint using the\r | |
| 23 | new stack specified by NewStack and passing in the parameters specified\r | |
| 24 | by Context1 and Context2. Context1 and Context2 are optional and may\r | |
| 25 | be NULL. The function EntryPoint must never return.\r | |
| 26 | Marker will be ignored on IA-32, x64, and EBC.\r | |
| 27 | IPF CPUs expect one additional parameter of type VOID * that specifies\r | |
| 28 | the new backing store pointer.\r | |
| 29 | \r | |
| 30 | If EntryPoint is NULL, then ASSERT().\r | |
| 31 | If NewStack is NULL, then ASSERT().\r | |
| 32 | \r | |
| 33 | @param EntryPoint A pointer to function to call with the new stack.\r | |
| 34 | @param Context1 A pointer to the context to pass into the EntryPoint\r | |
| 35 | function.\r | |
| 36 | @param Context2 A pointer to the context to pass into the EntryPoint\r | |
| 37 | function.\r | |
| 38 | @param NewStack A pointer to the new stack to use for the EntryPoint\r | |
| 39 | function.\r | |
| 40 | @param Marker VA_LIST marker for the variable argument list.\r | |
| 41 | \r | |
| 42 | **/\r | |
| 43 | VOID\r | |
| 44 | EFIAPI\r | |
| 45 | InternalSwitchStack (\r | |
| 46 | IN SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
| 47 | IN VOID *Context1, OPTIONAL\r | |
| 48 | IN VOID *Context2, OPTIONAL\r | |
| 49 | IN VOID *NewStack,\r | |
| 50 | IN VA_LIST Marker\r | |
| 51 | )\r | |
| 52 | {\r | |
| 53 | BASE_LIBRARY_JUMP_BUFFER JumpBuffer;\r | |
| 54 | \r | |
| 55 | //\r | |
| 56 | // Stack should be aligned with CPU_STACK_ALIGNMENT\r | |
| 57 | //\r | |
| 58 | ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0);\r | |
| 59 | \r | |
| 60 | JumpBuffer.Eip = (UINTN)EntryPoint;\r | |
| 61 | JumpBuffer.Esp = (UINTN)NewStack - sizeof (VOID*);\r | |
| 62 | JumpBuffer.Esp -= sizeof (Context1) + sizeof (Context2);\r | |
| 63 | ((VOID**)JumpBuffer.Esp)[1] = Context1;\r | |
| 64 | ((VOID**)JumpBuffer.Esp)[2] = Context2;\r | |
| 65 | \r | |
| 66 | LongJump (&JumpBuffer, (UINTN)-1);\r | |
| 67 | }\r |